Yea, it's unlikely we would change this. The reason it's not very different than the other katars is because SinX is already the strongest class there is. If we added anything else for them, especially with SB, it would be too overpowered. The reason the other weapons increase certain skills is because either those classes are weaker and we were trying to balance them, or we were trying to give different, more diverse options of playing a class.